Site amplification at five locations in San Francisco, California: A comparison of S waves, codas, and microtremors
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
Abstract
We compare microtremor data to weak-motion S-wave and coda recordings at sites in San Francisco in order to clarify the range of applicability of microtremor data to ground-motion prediction. We also compare S-wave results to coda results. For each type of data, we compute spectral ratios of motions from two soil/rock station pairs and from an uphole/downhole pair in the Marina district. We compute horizontal/vertical ratios (Nakamura's method) at a soil site, a rock site, and the surface and borehole instruments. In the station-pair analyses, microtremor data show amplifications at the same fundamental frequency as S waves, but the frequencies of other peaks do not agree. The amplification at frequencies higher than 2 Hz is greater in the microtremor data. Station-pair ratios of coda data generally show spectral peaks occurring at the same frequencies, but with levels varying from one to four times the amplification from S-wave ratios. Nakamura's method of analyzing microtremors agrees better with S-wave station-pair results than the microtremor station-pair method over a limited frequency band that varies from station to station.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Site amplification at five locations in San Francisco, California: A comparison of S waves, codas, and microtremors |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/BSSA0860030627 |
| Volume | 86 |
| Issue | 3 |
| Year Published | 1996 |
| Language | English |
| Publisher | Seismological Society of America |
| Description | 9 p. |
| First page | 627 |
| Last page | 635 |
| Country | United States |
| State | California |
| City | San Francisco |
| Google Analytic Metrics | Metrics page |